You will understand the ways in which the software will get from any state to another state, and (very importantly) if you can define every operation, then you can track and undo it as well.

您将会理解软件从一个状态转到另一个状态的方式，而且（非常重要），如果您可以定义某个操作， 那么同样可以追踪并撤销它。

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If something performs a single activity, then it really refers to a service operation.

如果执行单一活动，那么它实际上是指服务操作。

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If an operation is declared as abstract then the inheriting class must provide a concrete implementation.

如果某项操作被宣布为抽象的那么继承的类必须提供了一个具体的实施方案。

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However, they consistently approved the operation and one could argue that if a ten-year repayment was legal, then a forty-year repayment could also have been legal.

FORBES: Ireland's Promissory Note Deal

If the bombers were identified to be foreign nationals, then the Met would seek help and co-operation from Interpol and police in the countries concerned, she said.

BBC: Will the bombers be caught?